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为研究不同焊接输入条件对海面建筑用Q460NH钢的冲击性能的影响,分别在不同热输入条件下对Q460NH钢进行焊接,并在-30℃低温对Q460NH钢的冲击功和显微组织进行测试和观察。结果表明:当热输入为21 k J/cm时,Q460NH钢的冲击功达到最大值84 J;当热输入大于21 k J/cm时,Q460NH钢的冲击功呈现下降趋势。针状铁素体的面积分数随着热输入的增加呈先增加后减小的趋势,而侧板条铁素体和晶界铁素体的面积分数随热输入的增加呈先减小后增加的趋势。
In order to study the impact of welding input conditions on the impact performance of Q460NH steel for offshore construction, Q460NH steel was welded under different heat input conditions, and the impact energy and microstructure of Q460NH steel were tested at low temperature of -30 ℃ and Observed. The results show that the impact energy of Q460NH steel reaches a maximum of 84 J when the heat input is 21 kJ / cm and the impact energy of Q460NH steel decreases when the heat input is greater than 21 kJ / cm. The area fraction of acicular ferrite increases first and then decreases with the increase of heat input, while the area fraction of ferrite and grain boundary ferrite increases and then increases with the increase of heat input the trend of.